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    <meta charset="UTF-8">
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    <title>Document</title>
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<body>
    <script>
        // 1. 封装函数, 名字为sum
        // 2. 功能: 根据传入的两个数, 求和并且返回求和的结果（函数必须有return返回值）

        function Sum(x = 0, y = 0) {
            let max = x > y ? x : y
            return max
        }
        let max = Sum(1, 2)
        console.log(max);
    </script>
</body>

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